I like the opening right away. The ambient noise is awesome.
Constructively speaking, I think some of the synths are a little harsh and forward. Wetter reverb with less of a delay makes things sound father away, closer reverb makes things sound drier, and with more of a delay on the reverb starting.
I think for ambient, sometimes you want sounds to go in and out more rather than persisting. The horn in the second track should stop and stay stopped for a while, or it should drone more consistently and quietly I think.
Nicely done! :)